VDB
RHSA-2026:87026
RHSA-2026:87026
PUBLISHED
CVSS 7.800000190734863 HIGH
A flaw was found in sudo. When sudoers rules use NOTBEFORE or NOTAFTER time-based access restrictions with timestamps that omit the trailing 'Z' timezone indicator, the time evaluation relies on the TZ environment variable inherited from the calling user. Because sudo is a setuid-root program, an unprivileged local user can set TZ to an extreme timezone offset to shift the authorization window by up to approximately 25 hours, causing expired rules to be treated as valid. This allows the user to execute commands outside the intended time window. Authentication is not bypassed; only the time-based authorization check is affected.
Risk Scores
CVSS 3.1
7.800000190734863
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | sudo-debuginfo-0:1.9.5p2-1.el8_8.4.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-0:1.9.5p2-1.el8_8.4.src as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-0:1.9.5p2-1.el8_8.4.src as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-debugsource-0:1.9.5p2-1.el8_8.4.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-debugsource-0:1.9.5p2-1.el8_8.4.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-debuginfo-0:1.9.5p2-1.el8_8.4.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-0:1.9.5p2-1.el8_8.4.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-0:1.9.5p2-1.el8_8.4.ppc64le as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-debuginfo-0:1.9.5p2-1.el8_8.4.x86_64 as a component of Red Hat Enterprise Linux BaseOS E4S (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-debugsource-0:1.9.5p2-1.el8_8.4.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
| Red Hat | sudo-0:1.9.5p2-1.el8_8.4.x86_64 as a component of Red Hat Enterprise Linux BaseOS TUS (v.8.8) | 0:1.9.5p2-1.el8_8.4 |
Timeline
- Oct 21, 2026 CVE Published
- Oct 22, 2026 CVE Updated
- Oct 22, 2026 Distribution Patch
- Oct 22, 2026 Distribution Patch
- Oct 22, 2026 Security Advisory
- Oct 22, 2026 Security Advisory
References
- https://access.redhat.com/errata/RHSA-2026:87026 advisory
- https://access.redhat.com/security/updates/classification/#important advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2539327 issue
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_87026.json advisory
- https://access.redhat.com/security/cve/CVE-2026-96512 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-96512 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-96512 advisory
- https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c advisory